Principal components analysis corrects for stratification in genome-wide association studies.
Population stratification--allele frequency differences between cases and ...
Price AL, Patterson NJ, Plenge RM, Weinblatt ME, Shadick NA, Reich D,
http://dx.doi.org/10.1038/ng1847
Nat Genet. 2006 Aug;38(8):904-9. Epub 2006 Jul 23.
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